Core



v. L. cox.

coma. APPLICATION FILED SEPT. 18. I919.

Patented Mar. 15,1921;

3 SHEETS-SHEET I.

may. a $51,

Gwynne v. L. cox.

CORE, APPLICATION FILED SEPI- I'B, I9I9.

1,371,775, Patented Mar; 15, 1921.,

3 SHEETS-SHEET 2.

III] I N 6 A; M 6 1 13.5

V. L. COXL CORE. APPLlCATlON FILED SEPT. 18, 1919.

Patented Mar. 15, 1921.

a SHEETS-SHEET 3;

Suva 1km UNITED STATES VICTOR L. COX, OF MOUNT STERLING, OHIO.

CORE.

Specification of Letters Patent.

Patented Mar. 15, 1921.

Application filed September 18, 1919. Serial No. 324,351.

1 '0 all whom it may concern Be it known that I, Vroron L. Cox, a citizen of the United States, residing at Mount Sterling, in the county of Madison and State of Ohio, have invented new and useful Improvements in Cores, of which the following is a specification.

This invention relates to improvements in cores for the manufacture of the outer casin s of double tube'pneuniatic tires.

he object of the invention is to provide a core of the above named class formed of a plurality of separable sections adapted to abut in the form of an annulus whereby the various sections may be severably removed inwardly from the interior of the tire shoe or casing after the vulcanization thereof.

Another object of the invention is to form the entire core of comparatively thin sheet metal as contradistinguished from the usual cast metal cores to thereby reduce theweight of the core and reduce the labor incident to the use of the ordinary form of core,

Pneumatic tire casings are usually built up and vulcanized on a rigid core but it is well known that a better product can be produced by removing the core from the casing after the building up process-and'inserting an air bag into the cavity of the casing and after placing the casing in the cavity of a two part mold inflating the air bag and vulcanizing the casing under heavy pressure.

Another object of the invention is there fore to provide a core which may be used in the building up' process and which may also be used to stretch the casing during vulcanization.

I accomplish the above named object by forming a core of various sections each formed of two halves divided circumferentially along the periphery of the core and incorporate in each section mechanism for separating the two halves of each section laterally to thereby stretch the tire during vulcanization. The operation of the mechanism for separating the two halves of the various sections being operated by the mold 4 members during their inward movement t0- ward each other which takes place previous to' the vulcanizing operation so that the mold members are moved toward each other separating the core vmembers is operated simultaneously with the inward movement of the mold members. The operation of the spreading means for the core memberstakes place synchronously with the clamping together of the members of the mold.

l/Vith the foregoing and other objects in view the invention consists in the novel construction, combination and arrangement of parts to be hereinafter specifically described and illustrated in the accompanying drawings which form a part hereof wherein is shown the preferred embodiment of the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the matter hereinafter claimed.

In the drawings in which similar reference numerals indicate like parts in the dif- V ferent figures:

Figure 1 is a plan view of a core embody- 111 the present inventlon.

*1g. 2 18 a fragmentaryview enlarged of r a portion of the core shown in Fig. 1.

Fig. 3 is a similar View looking from a point within the inner circumference of said annulus. V

Fig. 4 is a transverse sectional view of a mold with the core positioned therein surrounded by a tire shoe and with the spreadin mechanism in its inoperative position.

ig. 5 is a similarview to ig. 4 with the s readin mechanism in its ooerative osition. I

Fig. 6 is a fragmentary plan view of-the exterior surface of the 7 core looking outwardly from the center of the annulus showing the spreading mechanism in the position shown in Fig. 4E.

Fig. 7 is a similar View to Fig. 6 showing the spreading mechanism in the position shown in Fig. 5. V

Fig. 8 is a sectional view of the spreading mechanism showing in connection therewith means for locking the two members of the core together during the building up of the tire. 1

Fig. 9 is a view similar to Fig. 8 with the locking mechanism inits inoperativeposition and the spreading mechanism in its operative position.

Fig. 10 is a perspective view of one'of the holding members for the spreading mechanism.

Fig. 11 is a penspective View of a pair of the holding members that are used. at the ends of each ofsaid separable sections.

Fig. 12 is a similar view of a pair of the holding members showing means for securing said separable sections in abutment against lateral displacement.

Fig. 13 is a fragmental perspective view severance between the section 1 and the sections 2 and 4: are oblique to a radius of the core and the same is true of the lines of severance between the section 3 and the sections 2 and l so that the sides of the sections 1 and 3 are approximately wedgeshaped to permit their easy inward withdrawal from the interior of the tirewshoe or carcass. All of the sections are split circumterentially along the tread or in other words each section is formed of twoopposing and similar members which are arranged cooperatively to form in cooperation a segment shaped section capable of forming a portion of *a core which constitutes means on which atire-shoe may be built up. In view of the fact that all of the sections are similarly formed of two opposing and complemental members, the reference numeral 5 is used to denote one-half of one section, for example and the numeral 6 to designate the opposing complemental section each of the members of each section is provided with inwardly extending flanges 7 so that wheat-he core sections are united the various core flanges form a continuous annulus extending inwardly from the core members and with the two flanges opposing each other and arranged in spaced relation to each other. The parts are so disposed that when assembled the ends of the members 6 on one sideof the core abut again-st similar members on the same side and the member 5 against similar members on the opposite side of the core and thereby form a substantially tubular annulus, the arrangement being such that, for example, when the two complemental members forming the section 2 are united the end portions thereof will abut against similar united members ofthe sections 1 and 3 and so on throughout the entire core.

When the spreading device is in its inoperative position as shownin Fig. 4:, it will be noted that the opposing complemental members 5 andti'are overlapped along the periphery of the core so that when the spreading mechanism is in its operative position as shown in Fig. 5, the core will still present a continuous unbroken surface to the inner face of the tire. In order to hold the opposing and com )lemental members 5 and 6 of each section oi the core together, I have provided a locking device for holding the two members in cooperation. This locking device is so fashioned that when in one position it constitutes a means for holding the oaaosin members of each section ri 'idl togctherand when in another position to release said members from a lockedposition and also to be engaged by the mold members for forcing the two members of each section away from each other for stretching the the shoe during vulcanieach having a curvilinearly formed head 9,

the outer face ofwhlch 1s fashioned to fit.

against the interior of one of the sections and be there retained by spot welding, riveting or other holding means 10 and provided with an extension 11, extending inwardly along the inner face of the flange of the section in which it is positioned. Each of these holding members is provided with a recess Band at its outer end with a bearing 13 and along the extension 11 with a bearing 14:. The bearings 13 and 14 are in alinement with each other and the bearing 13 is not cylindrical but has a flattened portion as shown in Fig. 10 and the outer portion of the bearing 14: is provided at 15 ,with a similar bearingfor a purpose to be later described. The holding members 8 are positioned or arranged in pairs with a plurality of pairs in each of the sections so that the recessed portion 12 of the members 8 on one-half of thesection, say 5, is oppositely disposed to the recessed portion of a similar member in the complemental half 6 of the same section, and the bearings 13 and 14 of the members 8 of thesame pair in each section are in radial alinement and in parallelism and constitute, when the two members 5 and 6 of the core section are united holding means or bearings for. the combined locking and spreading members.

Extending across, a proximately radially of the recesses 12 of t e holding members 8,

arethe bars 16, spaced from the lateral wall of the recess and in parallelism therewith.

As all of the combined locking and spreading members are similar, it is thought that a description of one will be sufiicient for the understanding of them all and the reference numeral 17 will be used generally to designate these members. Each member comprises a shaft 18 preferably formed integrally with which, are a pair of spaced locking members 19 disposed in pairs and with the members of each pair disposed diametrically opposite to 1 each other on the shaft and the pairs arranged in'spaced relation as shown in Figs. 2, 4 and 5. The general contour of each member of each pair is in the form of an S-shaped hook, 19, with the outer hook portions so positioned as to engage the cross bars 16 and hook over these bars for holding the two members 8 against movement with their inner opposing faces in engagement and of course the locking together of the various members 8 of the section holds the members 5 and 6 of each section against movement. When the shaft 18 is rotated in one direction the hooks 19 engage the rods 16 and when rotated in a reversed direction they disengage these from the rods and free separation of the two members of each mold is permitted. The position of the hooks or locking means for the two sections is indicated by dotted lines in Fig. 8 and the looking means are shown in their inoperative position in Fig. 9 with the two members 8 arranged in spaced relation. The inner I portion of each of the shafts 18 are pro vided with a pair of oppositely disposed cams, 20, preferably formed integrallywith the shaft 18 and arranged to lie in the position shown in Fig. 6, when the locking members are m the posltion shown 1n F 1g.

7 8 and lie in the position shown in Fig. 7

when the locking members 20 are ,in the position shown in Fig. 9. The inner end of each of the shafts 18 is provided with squared portions 21 to receive the operating wrench. The outer end of each of the shafts 18 is provided with flattened portion 22 as shown in Fi 2 which is arranged hrs-l A,

.to seat in the flattened bearing formed by the recesses 13 of the member 8 and is furthermore provided with a flattened portion 23 which is, arranged to lie in the flattened bearing formed by theportions 15 of the members 8. These flattened portions are so positioned that whenthe members 8 are in engagement with each other and the core sections are in a position for building up of a tire, these flattened portions 22 and 23 will be substantially received in the bearings formed by the recesses 13 and 15 when the locking members 19 are in the position shown in Fig. 8. The partial rotation of these flattened portionsserves to set up a wedging action for separating the members 8 and also the sections to which they are connected as shown in Fig. 9 thereby spreading the members 5 and 6 of the core moved as a unit from the interior of a sections for stretching the fabric of the tireshoe. The rotation of the shafts 18 inorder tolock the two halves'5 and 6 together is .accomplished by applying a wrench to the the bearings 13 and 15 forcing the two mold members 8 apart in unison with the mold members 5 and 6 andaccomplishing the function of stretching the fabric. As soon as the process of vulcanization is accomplished a wrench 'is-applied to the squared portions 21 and the various shafts are rotated to cause interengagement of the hooks 19 with the bars 16, looking the two halves 5 and 6 of each section together and then'the two halves of each section are retireshoe in the ordinary manner.

The halves 5 and 6 of each section 1 2,

3 and ears preferably constructed sci that the said halves have the knife-like edges whichoverlap along the peripheryof the.

core, as shown'at 24, Fig. 4. The width of the overlapped surface is sufficient to permit the lateral extension of the'two halves 5 and 6 without causing a break in the surface of the core, as shown at 2& in Fig. 5.

' The sections 1, 2,3 and 1 are held in abutment against longitudinal displacement by means of a ring composed of sec- V tions 25, 26, 27 and 28. The ring section 25 is attached to one of the halves of core section 1' and extends over the core sections 2 and 4 and is secured at one endto one of the halves ofssection 2 and at the other end to section 4 by means of bolts 29. The sections 2 and 3 are similarly united, likewise the sections .3fand 1. 7 H

The various sections of which the core is composed "are held in abutment againstlateral displacement by means of a tongue 30 and an accommodating groove 31, positioned on the abutting surfaces of the core sections 1, 2, 3 and 4. V 7

While I have described and shown a means for holding the various sections in abutment against lateral and longitudinal movement it is evident that the said sections may be secured in position in various ways. It is also apparent that although I have described an adaptation of my invention wherein the two halves of the core are comprised of separable sections that for use in constructing types of tires, the halves and .6 could each be made in the form of two tion provided with telescoping flange 31 as shown in Fig. 2.

Having thus described my invention what I claim as new and desire to secure by Let ters-Patent is 1. A core of the class described comprising a plurality of separable sections adapted to abut in the form of a tubular annulus, each of said sections divided into two opposing complemental'members along a circumferentially extending line conforming to a radius of the core, automatic means located within each section for laterally and parallelly separating said members when the core is placed within the cavity of amold.

2. A core of the classdescribed comprising a plurality of separable sections adapted when assembled to forma tubular annulus each of said sections divided into two opposing complemental members along a circumferentially extending line conforming to a radius of the core; each member provided with a plurality of strengthening members which extend inwardly from the inner wall thereof,v automatic means located within each section to releasably connect. said strengthening members, said means adapted when the core is placed within a cavity of a twopart member to disconnect'said members and force them laterally apart.

3. A core of the class described comprising a plurality of separable sections adapted to abut in theform of an annulus each 'of said sections divided into two members along a circumferentially extending line conforming to a radius of the core, means within each section to laterally separate said members comprising a pluralityof centrallypositioned radially extending rotatable shafts provided with'a plurality of hooks adapted to secure said members in attachment, said shafts .also adapted when rotated to disengage said hooks andfmo ve said members laterally apart.

i. In combination with a'tire vulcanizing mold, a tire building core divided into two annular halves and means located within said core to automatically move the halves laterally and parallelly apart when the same is placed within the cavity of said mold.

5. A tire building and stretching [core comprising an annular shell having "the shape of the interior of the tire, said shell formed of two halves adapted to overlap along the peripheral portions of the core,

said core having mechanismincorporated along the peripheral portions of the core,

each of'said halves composed of separable sections, means toihold said sections in abutment and means to laterally. extend said halves. v y

7. A tire building and stretching core comprising an annular shell having the shape of the interior of thetire to be constructed thereon, said shell formed of two halves adapted to overlap along. the peripheral portions of the core; each of said halves composed of separable sections, means to hold said sections in abutment and means to hold said halves in posltion during the 'buildingup ofthe tire and means to laterally extend said halves and enlarge the core during the vulcanization .of the tire.

8. A tire building and "stretching core comprising an annular shell having the shape of the interior of. the tire, said Shell formed of two halves adapted to overlap along the peripheral portions of the core, each of said halves composed of separable sections, means to hold said sections in abut ment and means to lock said halves rigidly together during the building up of the tire, said means automatically spreadlng the halves laterally upon said overlapped portions thereby extending the core when the same is placed within the cavity of a tire vulcanizing mold. V

In testimony whereof I have hereunto set In hand. r

y VICTOR 

